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1 Perigynia 3-4.5 mm long, the lower shorter than their subtending scales; culms often with basal spikes
|1 Perigynia 4-6 mm long, all exceeding their subtending scales; culms without basal spikes.|
|..2 Perigynia densely white-villous apically, glabrous basally; achene body 2.0-2.7 mm long, long-stipitate|
|..2 Perigynia puberulent throughout; achene body 3.0-3.3 mm long, sessile|